The circuit of the amplifier with TDA7294 was a big hit among our readers, so bring more than this version of the amplifier with TDA 7294 “Brutus,” this is an application bridge to the tda7294 that can provide up to 170 Watts @ 8ohms, 38 VDC.

The TDA7294 integrated circuit developed by SGS Thompson (www.st.com), allows you with little money, have a complete amplifier, it is designed as an AB class audio amplifier and is ideal for use in home systems Theater and high quality amplifiers for easy assembly. It is capable of working with 4, 8 and 16 Ohms loads (speakers). It is capable of delivering 100 Watts @ 4 Ohms, VS = + – 29V, 100 Watts @ 8 Ohms, Vs = + – 38V. The total distortion is only 0.1% at PO = 0.1 to 50 Watts and F = 20Hz at 20KHz.

In this version of Bridge or Bridge amplifier, keep in mind the impedance of the speakers! 8 Ohms is the minimum recommended is 16 ohms using only voltage up to +-38Volts.R = 8 Ohms VS =+-25VDC, PO = 150 Watts R = 16 Ohms Vs = +-35VDC, Po = 170 watts

The circuit is divided into two main parts the power supply and the power amplifier.

Power supply for Brutus – The power supply is composed of a 18-0-18 to 26-0-26 @ 350VA transformer, The bridge rectifier must be a GSIB2580 or equivalent, the capacitors can be from 4.700μF/50V Up to 10.000μF/50V. There are also 2 ceramic capacitors and 2 resistors, the function of these resistors is to discharge the large electrolytic capacitors, when you turn off the circuit.

Power amplifier – The amplifier part is configured to work in stereo bridged stereo, using 4 integrated circuits, resistors R11, R12, R17, R18 (R) and R13, R14, R20, R21 (L) determine the gain of the amplifier. With these components is set to 30 dB. The mute/Stand-by circuit is connected directly to the VCC of the circuit. The input impedance is determined by the resistors R4 and R9.

When assembling the integrated circuits in the heatsink, you must use insulated bushings to avoid electrical contact between the metal body of the IC and the heatsink.

About Brutus circuit assembly The printed circuit board suggested for this assembly is single face, to facilitate mainly the life of the beginners … however if it is simple face there comes Jumpers! Connect pieces of wire, interconnecting the dots, paying attention to the thickness of the jumpers at the power connection points.

Hi, I hv designsd this according to ur layout but my IC2 (the first one as on layout) got heated excessively !!! The circuit is working however but this particular positioned ic is heated up too high … I have tried replacing three ic’s in that position along wth the capacitors too but getting same problem… Plz help …

Hi Toni, I builted brutus amplifier and it doesn’t work correct. Once, I start the amplifier without load, it start increasing the temperature to the ics and bridge rectifier rapidly. Please, I would like some to find the problem

hi toni, i made this… super amazing amp… nice clearity & bass ! 100000…thanks toni.. I like u so much. Thanks,keep it up man. (&i also made your another some circuits, all are success &great) plz give your email id.

Sir. the project is very nice and cool, i want to plead that you made a mistake listing the parts, the 22k resistor color code should be Red-Red-Orange not Red-Orange-Orange. once again thanks for this projects….it quality is amazing.

hello as scan the schematic diagram….the (R6,R7=4.7K 1/2 watt) (R12,R14,R18,R21=680 ohms 1/4 watt) (R5,R10=47K 1/4watt)………….before i will built also this project circuit…… email me at ferrerronaldo300@gmail.com what will be the outcome and result….

Hi Toni, Thanks for the wonderful post. I am planning to use this circuit for my Subwoofer but want to make some small changes in the PCB before doing so. Could you please send me the eagle files to my email. Thanks

Hello, I’m very interesting in this project,but I cannot download the PDF file in my area.Would you mind to send me the file Via email? Thankyou very much ! Can you send me PCB for this amplifier TDA7294 2x150W on this email kulamario@vodafone.ie

Can we again bridge the two channels left and right for subwoofer application, Please suggest. If so please help me to understand how to bridge the two channels to a single output with total 300+ watts.

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